/*
 *
 *  Copyright 2016 Netflix, Inc.
 *
 *     Licensed under the Apache License, Version 2.0 (the "License");
 *     you may not use this file except in compliance with the License.
 *     You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 *
 */
package com.netflix.metacat.common.type;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import lombok.Getter;

import java.util.List;

/**
 * Array type class.
 *
 * @author zhenl
 */
@Getter
public class ArrayType extends AbstractType implements ParametricType {
    /**
     * default.
     */
    static final ArrayType ARRAY = new ArrayType(BaseType.UNKNOWN);
    private final Type elementType;

    /**
     * Constructor.
     *
     * @param elementType elementtype
     */
    public ArrayType(final Type elementType) {
        super(TypeUtils.parameterizedTypeSignature(TypeEnum.ARRAY, elementType.getTypeSignature()));
        this.elementType = Preconditions.checkNotNull(elementType, "elementType is null");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public TypeEnum getBaseType() {
        return TypeEnum.ARRAY;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Type createType(final List<Type> types, final List<Object> literals) {
        Preconditions.checkArgument(types.size() == 1, "Expected only one type, got %s", types);
        Preconditions.checkArgument(literals.isEmpty(), "Unexpected literals: %s", literals);
        return new ArrayType(types.get(0));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public List<Type> getParameters() {
        return ImmutableList.of(getElementType());
    }
}
